It's one of those grey areas that are keeping the the buyers and sellers out of trouble. If they are labeled as research chemicals for scientific study and not for human consumption it allows them to be sold with little FDA interference. There are a lot of things that can be bought that way, DNP, various anti-estrogen drugs, clenbuterol, etc......

It's sorta like when meatheads found out that Finaplex and Synovex-H were legal unregulated drugs for agriculture, except now, instead of being cattle farmers, they've turned into scientists.